LVS+keepalived简单配置实例
一、基本信息系统：
CentOS 6.5 （2.6.32-220.el6.x86_64）
软件：
ipvsadm-1.24.tar.gz
keepalived-1.2.2.tar.gz
二、拓扑结构图
虚拟I P地址: 172.16.32.200
DR1_MASTER: 172.16.32.203
DR2_BACKUP: 172.16.32.204
Web1: 172.16.32.205
Web2: 172.16.32.206
三、安装配置
1.在DR1和DR2上面操作（172.16.32.203/172.16.32.204）
查看是否支持IPVS
#lsmod |grep ip_vs 或#modprobe -l |grep ipvs
创建软连接（不创建链接会出现：libipvs.h:14:23: net/ip_vs.h: No such file or directory等编译错误。）
#ln -s /usr/src/kernels/2.6.32-220.el6.x86_64/ /usr/src/linux
2.DR服务器安装ipvsadm及keepalived，软件存放在/data/software/目录中
#cd /data/software
#tar zxvf ipvsadm-1.24.tar.gz
#cd ipvsadm-1.24/
#make && make install
#cd ..
#tar zxvfkeepalived-1.2.2.tar.gz
#cd keepalived-1.2.2/
#./configure
#make && make install
#cp /usr/local/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/
#cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/
#mkdir /etc/keepalived/
#cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/
#cp /usr/local/sbin/keepalived /usr/sbin/
3.编写LVS脚本实现负载均衡
#vim /usr/local/sbin/lvs-dr.sh 内容如下：
#!/bin/bash
# description: start LVS of DirectorServer
#Written by :NetSeek http://www.linuxtone.org
GW=172.16.32.1
# website director vip.
SNS_VIP=172.16.32.200
SNS_RIP1=172.16.32.205
SNS_RIP2=172.16.32.206
. /etc/rc.d/init.d/functions
logger $0 called with $1
case "$1" in
start)
# set squid vip
/sbin/ipvsadm --set 30 5 60
/sbin/ifconfig eth0:0 $SNS_VIP broadcast $SNS_VIP netmask 255.255.255.255 broadcast $SNS_VIP up
/sbin/route add -host $SNS_VIP dev eth0:0
/sbin/ipvsadm -A -t $SNS_VIP:80 -s wrr -p 3
/sbin/ipvsadm -a -t $SNS_VIP:80 -r $SNS_RIP1:80 -g -w 1
/sbin/ipvsadm -a -t $SNS_VIP:80 -r $SNS_RIP2:80 -g -w 1
touch /var/lock/subsys/ipvsadm >/dev/null 2>&1
;;
stop)
/sbin/ipvsadm -C
/sbin/ipvsadm -Z
ifconfig eth0:0 down
ifconfig eth0:1 down
route del $SNS_VIP
route del $SS_VIP
rm -rf /var/lock/subsys/ipvsadm >/dev/null 2>&1
echo "ipvsadm stoped"
;;
status)
if [ ! -e /var/lock/subsys/ipvsadm ];then
echo "ipvsadm stoped"
exit 1
else
echo "ipvsadm OK"
fi
;;
*)
echo "Usage: $0 {start|stop|status}"
exit 1
esac
exit 0
4.利用Keepalvied实现负载均衡和和高可用性
#vim /etc/keepalived/keepalived.conf #配置keepalived.conf文件具体内容如下：
! Configuration File for keepalived
global_defs {
notification_email {
# cnseek@gmail.com
lixuan@miaodai.cn
wanghaichao@miaodai.cn
# failover@firewall.loc
# sysadmin@firewall.loc
}
notification_email_from Alexandre.Cassen@firewall.loc
smtp_server 127.0.0.1
# smtp_connect_timeout 30
router_id LVS_DEVEL
}
# 20150110 written by :netseek
# VIP1
vrrp_instance VI_1 {
state MASTER #DR2上面将此处的 MASTER 改为 BACKUP
interface eth0
virtual_router_id 51
priority 100 #DR2上面将此处的 100 改为 90
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
172.16.32.200
}
}
virtual_server 172.16.32.200 80 {
delay_loop 6
lb_algo wrr
lb_kind DR
persistence_timeout 60
protocol TCP
real_server 172.16.32.205 80 {
weight 3
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
real_server 172.16.32.206 80 {
weight 3
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
}
5.在Web1和Web2上面编写realserver.sh脚本
#vim /usr/local/sbin/realserver.sh#内容如下：
#!/bin/bash
# description: Config realserver lo and apply noarp
#Written by :NetSeek http://www.linuxtone.org
SNS_VIP=172.16.32.200
. /etc/rc.d/init.d/functions
case "$1" in
start)
ifconfig lo:0 $SNS_VIP netmask 255.255.255.255 broadcast $SNS_VIP
/sbin/route add -host $SNS_VIP dev lo:0
echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce
echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce
sysctl -p >/dev/null 2>&1
echo "RealServer Start OK"
;;
stop)
ifconfig lo:0 down
route del $SNS_VIP >/dev/null 2>&1
echo "0" >/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "0" >/proc/sys/net/ipv4/conf/lo/arp_announce
echo "0" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce
echo "RealServer Stoped"
;;
*)
echo "Usage: $0 {start|stop}"
exit 1
esac
exit 0
6.在Web1和Web2服务器/etc/sysctl.conf 配置文件末尾添加如下内容：
net.ipv4.conf.lo.arp_ignore = 1
net.ipv4.conf.lo.arp_announce = 2
net.ipv4.conf.all.arp_ignore = 1
net.ipv4.conf.all.arp_announce = 2
#sysctl -p #示在/proc/sys目录中指定的内核加载参数
7.启动lvs-dr.sh 和 realserver.sh 脚本
在DR1和DR2上面启动 lvs-dr.sh 脚本
#cd /usr/local/sbin/
#sh lvs-dr.sh start
#watch ipvsadm -ln #查看LVS状态如下：
Every 2.0s: ipvsadm -ln Thu Mar 12 19:04:41 2015
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP172.16.32.200:80 wrr persistent 60
-> 172.16.32.206:80 Route 30 0
-> 172.16.32.205:80 Route 30 0
在Web1和Web2上面启动realserver.sh脚本
#cd /usr/local/sbin/
#sh realserver.sh start
#ip a
1: lo:mtu 16436 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet 172.16.32.200/32 brd 172.16.32.200 scope global lo:0
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0:mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 00:0c:29:88:b6:73 brd ff:ff:ff:ff:ff:ff
inet 172.16.32.205/24 brd 172.16.32.255 scope global eth0
inet6 fe80::20c:29ff:fe88:b673/64 scope link
valid_lft forever preferred_lft forever
#tailf /var/log/message #监听日志，查看服务运行状态
8.Web1和Web2安装httpd 服务页面更改，以方便测试。
#yum install httpd -y
#service httpd start
四、测试
1.打开浏览器输入虚拟IP 测试 http://172.16.32.200
2.停止DR1的keepalived服务或者网卡查看DR2是否能正常接管
3.停掉Web1或者Web2任意一台服务器的web服务，测试访问页面是否正常
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